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A vacuum flask or Dewar flask has the remarkable capacity to hold extremely cold liquids like liquid nitrogen for a considerable length of time. The boiling point of liquid nitrogen is 77K compared to a room temperature of about 300K. You can hold liquid nitrogen for about a day without even a cover on the flask! You might expect such a cold liquid to explosively evaporate on contact with air in such an open container. How does it manage this containment? Clearly, the flask is able to effectively block heat transfer from the outside either through the walls or through the open top. The blocking of heat transfer into the liquid nitrogen from the top of a vacuum flask involves the insulating properties of gases and the ideal gas law. The gas above the liquid surface can be presumed to be dry nitrogen. When the ideal gas law is applied at approximately constant atmospheric pressure: So the cold nitrogen above the liquid occupies about one-fourth of the space it would occupy in the surrounding room- temperature air. The dry nitrogen at about four times normal density forms an effective insulating "stopper" on top of the liquid.
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Plastic Travel Mug (77) Stainless Steel Insulated Mug (108) Animal Mug (78) Plastic Cup (199) Vacuum Flask Set (25) Paper Cup (22) Tea Set (15) Kid Water Bottle (23) Tea Maker (42) Glass Cup (38) Plastic Mug (55) Metal Travel Mug (27) Vacuum Flask (40) Shrink Cup (7)

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Stainless Steel Cup
ID: HP-024457
Stainless Steel Mug
ID: HP-024084
Pot insulation package
ID: HP-022660
White enamel coverall cup
ID: HP-021999
Stainless cup suit
ID: HP-021284
Stainless steel cup coverall
ID: HP-020871
Stainless steel cup
ID: HP-004178
Camp jar
ID: HP-004143
Camping jar
ID: HP-004147
Travel bullet
ID: HP-004148
Sports cup
ID: HP-004173
Water jar
ID: HP-003846
Cup
ID: HP-004191
Cup
ID: HP-004192
Cup
ID: HP-004193
Cup
ID: HP-004194
Stainless cup suit
ID: HP-004179
Stainless cup suit
ID: HP-004180
750ML Travel cup
ID: HP-004171
Travel cup
ID: HP-004172

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